m-lab / locate / 1588

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Avoids a nil pointer dereference error in Geo() (#227)

* Avoids a nil pointer dereference error in Geo()

There was a case in staging where Locate was returning this for a host:

  "neubot-mlab4-syd04.mlab-staging.measurement-lab.org": {
    "Health": null,
    "Registration": null,
    "Prometheus": {
      "Health": false
    }
  },

... this was causing a panic in Locate. This commit avoids this, and adds a new
unit test to be sure it working as intended.

* Fixes a few typos in a comment in Geo()

9 of 9 new or added lines in 1 file covered. (100.0%)

2018 of 2097 relevant lines covered (96.23%)

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